<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<h2>aaaaaaaaaaaaaaaaaaaaaaaaaaa</h2>
</body>
<script type="text/javascript">
	// nav=screen.width;
	// nav=screen.height;
	// nav=screen.availWidth;
	// nav=screen.availHeight;
	alert(nav);





</script>
</html>